1397855 has 4 divisors (see below), whose sum is σ = 1677432. Its totient is φ = 1118280.

The previous prime is 1397839. The next prime is 1397857. The reversal of 1397855 is 5587931.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1397855 - 2⁴ = 1397839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139781 + ... + 139790.

It is an arithmetic number, because the mean of its divisors is an integer number (419358).

2^1397855 is an apocalyptic number.

1397855 is a deficient number, since it is larger than the sum of its proper divisors (279577).

1397855 is an equidigital number, since it uses as much as digits as its factorization.

1397855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279576.

The product of its digits is 37800, while the sum is 38.

The square root of 1397855 is about 1182.3091812212. The cubic root of 1397855 is about 111.8117319622.

The spelling of 1397855 in words is "one million, three hundred ninety-seven thousand, eight hundred fifty-five".